fuser

Synopsis

Description

The fuser utility displays the process IDs of the processes that are
using the files specified as arguments.

Each process ID is followed by a letter code. These letter codes
are interpreted as follows. If the process is using the file as

c

Indicates that the process is using the file as its current directory.

m

Indicates that the process is using a file mapped with mmap(2). See mmap(2) for details.

n

Indicates that the process is holding a non-blocking mandatory lock on the file.

o

Indicates that the process is using the file as an open file.

r

Indicates that the process is using the file as its root directory.

t

Indicates that the process is using the file as its text file.

y

Indicates that the process is using the file as its controlling terminal.

For block special devices with mounted file systems, all processes using any
file on that device are listed. For all types of files (text
files, executables, directories, devices, and so forth), only the processes using that
file are reported.

For all types of devices, fuser also displays any known kernel consumers
that have the device open. Kernel consumers are displayed in one of
the following formats:

If more than one group of files are specified, the options may
be respecified for each additional group of files. A lone dash cancels
the options currently in force.

The process IDs are printed as a single line on the standard
output, separated by spaces and terminated with a single new line. All
other output is written on standard error.

Any user can run fuser, but only the superuser can terminate another
user's process.

Options

The following options are supported:

-c

Reports on files that are mount points for file systems, and any files within that mounted file system.

-d

Report device usage information for all minor nodes bound to the same device node as the specified minor node. This option does not report file usage for files within a mounted file system.

-f

Prints a report for the named file, not for files within a mounted file system.

-k

Sends the SIGKILL signal to each process. Since this option spawns kills for each process, the kill messages may not show up immediately (see kill(2)). No signals will be sent to kernel file consumers.

-n

Lists only processes with non-blocking mandatory locks on a file.

-ssig

Sends a signal to each process. The sig option argument specifies one of the symbolic names defined in the <signal.h> header, or a decimal integer signal number. If sig is a symbolic name, it is recognized in a case-independent fashion, without the SIG prefix. The -k option is equivalent to -sKILL or -s9. No signals will be sent to kernel file consumers.

-u

Displays the user login name in parentheses following the process ID.

Examples

Example 1 Reporting on the Mount Point and Files

The following example reports on the mount point and files within the
mounted file system.

example% fuser -c /export/foo

Example 2 Restricting Output when Reporting on the Mount Point and Files

The following example reports on the mount point and files within the
mounted file system, but the output is restricted to processes that hold
non-blocking mandatory locks.

See Also

Notes

Because fuser works with a snapshot of the system image, it may
miss processes that begin using a file while fuser is running. Also,
processes reported as using a file may have stopped using it while
fuser was running. These factors should discourage the use of the -k option.